Luke Visconti, founder of DiversityInc, recently addressed this question in an article on his website. Here's an excerpt:
Upon returning to my office, re-energized by the DiversityInc event in March, I shared the information you addressed during your talk [when you] spoke about DiversityInc and mentioned your Ask the White Guy feature. When mentioning your feature to a group of white female colleagues, one responded by saying, what does he (a white guy) have to do with diversity; how does he create something like DiversityInc and how could he possibly speak with authority about diversity?
This is a great perspective on the nature of diversity. Visit the DiversityInc website to read the full article.